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int Impare(int n)
{
    int uj = 0;
    bool van = false;
    int p = 1;

    while (n > 0) {
        int szj = n%10;

        uj = uj + szj * p;
        p = p * 10;

        if (szj % 2 != 0) {
            van = true;

            uj = uj + szj * p;
            p = p * 10;
        }

        n = n / 10;
    }

    if (van)
        return uj;
    else
        return -1;
}